Dust-arresting and air-purifying device.



W. E, DWYER. I DUST ARRESTING AND AIR PUDIFYING DEVICE.

APPLICATION FILED JAN. 28, 1910.

Batented Feb. 14, 1911.

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W. B'. DWYBR. DUST ARRESTING AND AIR PURIFYING DEVICE. APPLICATION FILED 1111.28, 1910.

Patented Feb. 14. 1911.

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w. 3. DWYER. 1 'DUS'D ARRESTING AND AIR PURIFYING DEVICE.

APPLICATION FILED JAN. 28, 1910 Patented Feb. 14, 1911.

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W. E. DWYBR. DUST ARRESTING AND AIR. PURIFYING DEVICE.

APPLICATION FILED JAN. 28, 1910.

Patented F6b.'14, 1911.

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WILLIAM E. DWYER,

OF LEADVILLE,

COLORADO.

DUST-ARRESTING AND AIR-PURIFYING DEVICE.

Application filed January 28, 1910.

To all whom it may concern:

Be it known that I, lVILLIAM E. Dwrnn, a citizen of the United States, residing at Leadville, in the county of Lake and State of Colorado, have invented certain new and useful Improvements in Dust-Arresting and Air-Purifying Devices, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to improvements in dust-collecting and air-purifying devices for use in connection with pneumatic rock drills and the like.

Gne object of the invention is to provide adevice of this character which will not only collect the dust produced by the drill but will also purify the air coming from the drill by the removal ofvery fine particles of ore and other impurities which are so injurious to life in sulfur and lead mines.

Another object of the invent-ion is to provide a device of this character which may be used with the ordinary mining drills and which needs no special tool or appliance to permit of its use in connection with pneumatic rock drills.

Further objects of the invention are to improve the construction and operation of devices of this character and thereby render them more eflicient and less expensive.

lVith the above and other objects in View, the invention consists of the novel construc tion, combination and arrangement of parts, hereinafter fully described and claimed, and illustrated in the accompanying drawings in which Figure 1 is a longitudinal section through one embodiment of my invent-ion showing the use of the same; Fig. 2 is a side elevation of the device; Figs. 3 and 4: are sectional views taken on the lines 33 and 44 in Fig. 1; Fig. 5 is a perspective view of the tubular member or mouth piece which enters the drill hole; Fig. 6 is a side elevation of a modified form of the invention; Fig. 7 is a longitudinal section through parts shown in Fig. 6; Figs. 8 and 9 are transverse sectional views taken on the lines 88 and 9-9 in Fig. 6; Fig. 10 is a perspective View of the tubular member or mouth piece shown in Fig. 6; Fig. 11 is a side elevation of another form of tubular member or mouth piece; Figs. 12 and '13 are longitudinal and transverse sectional views through the same; Fig. 14 is a longitudinal section through another embodiment of the invention; Figs. 15 and 16 Specification of Letters Patent.

Patented Feb. 14, 1911.

Serial No. 540,643.

are detail sectional views taken respectively on lines 1515 and 16-16 in Fig. 14; and Fig. 17 is a perspective view of the tubular member or mouth piece shown in Fig. 1 1.

Referring more particularly to Figs. 1 to 5 inclusive of the drawings the numeral 1 denotes a casing or sheath arranged to surround an ordinary bit B of a drilling machine M and adapted to have at one end an air-tight joint o-r'connection with the drill hole H, and at its other end an air-tight connection with a drill or other portion of the machine M. The casing 1 is adapted to serve both as a dustcollecting chamber, and also as a purifier or filter. The latter object may be accomplished in diiferent ways, for example, it may be attained by making the casing of fabric which is sufficiently porous to permit of the escape of air without allow ing any of the line particles of dust, ore or other impurities to escape, as hereinafter more fully explained; or said casing may be made of other flexible material of a heavier nature such as canvas or similar fabric or leather, in which case it is provided with an outlet opening or portion covered with a suitable screen or screening material which will allow the escape of air and effectively prevent the escape of impurities.

As illustrated in Fig. 1 the casing or chamber 1 is provided atits rear with a tubularoutlet portion or pocket 2 which is covered with or contains a sponge 3 which will serve as a filter or screen, but it will be understood that a fine wire screen or one of other form and construction which will effect the desired result, may be employed in lieu of the sponge. By making the casing porous or of non-porous material and providing it with a filter or screening substance it will be seen that the escape of injurious particles of dust and other impurities will be effectively prevented so that the air com ing from the pneumatic drill will be puritied and rendered non-injurious to those working in the mine. The chamber or casing 1 may be of any size, shape and construction, but as illustrated in Fig. 1 it is of rectangular shape and depends from the drill, the latter passing through its upper portion.

The air-tight joint or connection between the chamber or casing 1 and the drill hole may be elfected in various ways but I preferably provide a tubular member or mouth piece 4 of such construction that it may be inserted in an ordinary drill hole. It is well understood by those versed in the art that drill holes used in mining operations are made by a set of drill bits, usually six in number and graduated in size, the one first used being the largest so that the outer end of the hole is of greater diameter than the inner end or bottom. I therefore construct the tubular member or mouth pieced-so that it may be inserted in the outer end of an ordinary drill hole in order to dispense with. the necessity of using extra bits or tools to enlarge the drill hole. I therefore make the tubular member or mouth piece of tapered cylindrical form and diametrically expansible so that it can be inserted in holes varying in size. It is preferably formed from a single plate of resilient sheet metal bent into substantially cylindrical form and preferably having its edges overlapping, as shown more clearly in Figs. i and 5. When thus constructed it may be contracted to permit of its insertion in the hole H and when it is released it will expand in the hole to provide a tight joint or connection. The projecting outer end of the mouth piece a is adapted to be connected to the casing or chamber 1, such connection being preferably eifected by forming on the casing a tubular neck 5 to receive the mouth piece, which neck, like the casing is made of flexible fabric, and by providing means of contracting the neck 5 around the mouth piece to retain the parts in engagement at any diametrical adjustment of the mouth piece. This may be accomplished by employing an annular elastic band (3 of rubber or the like and by providing on the mouth piece or member at stop lugs 7. These lugs are shown in Fig. 5 as being integral with'the mouth piece 4t and formed by making parallel slits in. the end of said mouth piece and bending outwardly the tongues formed by said slits.

In Figs. lt, 15 and 17, of the drawings I have shown a tubular member or mouth piece 1 which is quite similar to the one just described, it being constructed of a sheet of resilient metal bent into tubular shape and having the edge of its large outer end bent or folded outwardly to provide a retaining bead or flange 7 which serves the purpose of the stop lugs 7 The neck 5 of the casing or chamber 1 is provided with a hem 5 which contains a drawing string 6 adapted to retain the neck 5 on the mouth piece 4, as will be readily understood on reference to the drawings.

In the embodiment of the invention illustrated in Figs. 14 to 17 inclusive the casing 1 is preferably made of substantially circular shape and it is constructed of a fabric material sufliciently porous to permit of the escape of air but which will prevent the passage of dust and other impurities; and

owing to it being constructed of such mate rial it is not provided with an extra screen or filtering member, the fabric material it self forming the filtering or screening substance.

The air-tight joint or connection between the casing or chamber 1 in Fig. 1 and the drill or machine may be effected by providing on the upper portion of the rear edge of the casing a flexible, diametrically adjustable, tubular neck or extension 8 through which the drill extends, and which is adapted to be wrapped close a ound the drill by a cord, strap or the like, 9 which has one of its ends attached at 10 to said neck, and its other end attached to a weight 11. The intermediate portion of the strap 9 is wrapped once around the neck 8 so that the weight will draw the strap tight and cause it to bind the neck upon the drill or other part of the machine.

Instead of employing the strap and weightjust described I may substitute a spring clip 12 shown in Fig. 6 of the drawing. This clip consists of a substantially circular spring which surrounds the neck t of the casing 1 and which has one of its ends attached by a rivet 13 and reinforcing plate 1 1- to said neck.

In Figs. 1 1 and 17 of the drawings I have shown another form of connection between the casing and the bit or drill, the same comprising a tubular neck 8 which is wrapped around the bit and which receives a spring clip 12 similar to the clip 12. The clip 12, however, is not attached to the neck 8 but has an outwardly bent apertured end through which passes an attaching cord 12 the latter having one end secured to a loop or tab 12 on the casing 1, and the other end of said cord being knotted to prevent the spring clip from slipping off of the cord and becoming lost.

In Figs. 6, 7 and 8, of the drawing I have illustrated another form of tubular member or mouth piece which may be used on the casing for the purpose of effecting an airtight connection with the drill hole. This tubular member is likewise constructed of a piece of resilient sheet metal bent to form a longitudinally split cylindrical tube 4t. The casing 1 has at the upper portion of its front end a tubular neck or extension 5 wall of the drill hole I provide on the outer 7 end of the tube or member 4: rearwardly turned spring arm 16, which latter may be The neck 5 has at its front end a formed integral with said tube or member and which are disposed beneath the packing flange 15 to actuate the same outwardly. To further expend the packing flange or member 15 I may provide around the tube or member 4 and the neck 5 an expanding coil of round or fiat resilient wire. This coil is designated by the numeral 17 and is of conical form, its small front end having connected to it at opposite points rearwardly extending operating arms 18 which are disposed within the coil and which have outwardly bent finger pieces 19 at their rear ends. It will be seen that when the finger pieces 19 are grasped and the arms 18 are sprung together the small front end of the cone-shaped coil will be contracted to contract the member or tube 4* and thereby enable it to be readily inserted in the drill hole, and that when said arms are released the resiliency of the coil will expand the packing flange 15 or assist the arms 16 in expanding the same.

In Figs. 11, 12 and 13, of the drawings I have shown still another form of expansible mouth piece for effecting an airtight joint between the collecting casing or chamber and the drill hole. This mouth piece comprises a tubular member 4 in the form of a cylindrical band or ring which is riveted or otherwise secured on the inside of a tubular neck 5 formed on the casing or chamber 1 The ring or hand a is secured adjacent to the outer edge of the neck 5 and said edge or end of the latter is then folded back over the ring or member 4 The folded part or flange 15 of the neck 5" is adapted to serve as a packing andit is expanded by arranging within it a split expanding ring 20 constructed of resilient metal and adapted to be contracted and expanded by a pair of tongs consisting of cross levers 21 pivotally united attheir points of intersection and having their front ends 23 secured to the expanding ring or band 20 adjacent its spaced ends, the rear ends of said levers being provided with handles 24. It will be noted that when the handle 24': of the levers are brought together the expanding ring will be contracted to permit the device to, be inserted in a drill hole and that when said levers are released the ring or band 20 will expand and press the packing flange 15 in contact with the wall of the drill hole.

In using my invention the drill hole is started with the large size bit and made deep enough to receive the tubular member or mouth piece of the device, and owing to the peculiar construction of the latter, it

will be seen that the necessity of an extra tool or bit to enlarge the drill hole is obviated. On referring to Fig. 1 it will be seen that the exhaust from the pneumatic drilling machine M passes through the bit B, which is tubular and serves to drive the dust inwardly from the bottom of the drill hole and into the collecting casing or chamber as indicated by the arrows in said figure. The dust and chippings from the drill will settle on the bottom of the casing, and the air will pass out of the same either through the porous material from which it is made or else through the screen or filter provided at its outlet portion.

Having thus described the invention, what is claimed is:

1. A dust arresting device of the class described, comprising a casing having diametrically adjustable necks, means to fit and secure one of said necks on a drill, a diametrically adjustable tubular member in the other neck and for insertion in a drill hole, and diametrically adjustable means to clamp the last named neck on the said tubular member.

2. A dust arresting device of the class de scribed, comprising a casing of flexible material having means to permit the discharge of air and prevent the discharge of dust therefrom, the said casing being further provided with diametrically adjustable necks, one for engagement with a drill and having diametrically adjustable means to secure said neck on the drill, a tubular longitudinally adjustable member in the other neck, and for insertion in a drill hole, and diametrically adjustable means to clamp the last named neck on the said tubular member.

3. In a dust arresting device of the class described, the combination of a dust and air receiving casing having a flexible diametrically adjustable neck, a diametrically adjustable tubular member in the said neck and provided near one end with stop devices engaged by said neck, and diametrically adjustable clamping means on said neck coacte ing with said stop devices to secure said neck on said tubular member against longitudinal displacement .and also serving to clamp said neck on said tubular member irrespective of the diametrical adjustments of the latter. P

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

PATRICK BRENNAN, JOHN N. MoMAHoN. 

